Refreshing and of Wonder
The concept of a 3D and sidescrolling game sounds quite rare, even today. If it shares the elegance that Donkey Kong Country had, it's all right in my book. There's a feel about this work where it's as if the character or surrounding scene is constantly in motion, like a shoot-em up, as not all shmups necessarily have to have music that's full of action and edge-of-your-seat tensity.
I could see this work featured in a top-down adventure/RPG like Secret of Evermore, if that could more accurately describe what your friend's game looks like.
The inclusion of the string section alongside the piano gives off a feeling that I can't quite describe. It seems as if this addition seems to emphasize, at least for a time, that these answers and questions that the girl is looking for, are vital to her survival, and/or she's faced with many dangers, on her journey, which sounds a bit dramatic, in the least for this game.
I wish the friend (and the character) luck in coming to a satisfying finish!